Node.js CAS Client Middleware

http-cas-client provides a comprehensive Central Authentication Service (CAS) client middleware for Node.js environments, supporting CAS 1.0, 2.0+, and 3.0+ protocols. As of version 0.4.3, it offers core features like Single Sign-On (SSO), CAS Proxy capabilities (including proxy chain checking), and Single Logout (SLO). The library is designed to be framework-agnostic, providing direct integration with Node's native `http` module and specific wrappers for popular frameworks like Koa2, with support for both session-based and no-session modes. While actively maintained, the package is still in a pre-1.0 state, indicating potential for further evolution before a stable API is declared. Key differentiators include its explicit support for various CAS protocol versions and its flexibility in integration patterns, including cluster-friendliness (though this feature is marked 'TODO' in the README) and principal adaptation for debugging.